Vibrating screen



Aug. 13, 1929. J. CRABB, SR

VIBRATING SCREEN Filed Nov. 26. 1926 2 Sheets-Sheet Aug. 13, 1929. J.CRABB, SR

VIBRATING SCREEN Filed Nov. 26, 1926 Registered Aug; 13,1929;

UNITED STATES PATENT OFFICE.

JAMES CRABB, SR.-, OF JULIET, ILLINOIS.

vIBnA'rme scnnmr.

Application filed November 26, 1926. Serial No. 150,823.

"and in which the abrading action of the pieces of coke is reduced toa-minimum.

Another and further object of my inventionis the provision of ascreening apparatus which effectually removes coke dust and fineparticles and broken pieces of coke from the larger material withoutsubjecting the coke to hard shocks or to an abrading movement over thescreen so that the dust and fine particles of coke are removed'from thelarger piecesand not carried over the screen attached to or supported bythe larger, pieces of coke, as is common with the present type ofscreens, or the coke broken in finer particles, the screens being somounted that they vibrate or rock about the center of the screens.

Another and further object of my invention is the provision of a cokescreen ap-' paratus in which the pieces of coke as they pass over thescreen are vibrated in different degrees so as to cause the coke to passover the screen by vibration and not slide upon the screens and yetthoroughl' remove the small. particles of coke from t e major portion asit passes over the screen. Another and further object of my invention isthe provision of a screen having'a rocking vibratory action impartedthereto by means of which the material which. is being screened iscaused to travel over the screening surface by being thrown across thescreening surface in a series of steps rather than being slid across thesurface, thus resulting in a minimum of abradingaction of the coke as itpasses over the screenstland also in which a plurality of screens arearranged in such relation to each other that decreasing movement isimparted to the coke as it passes over the screens, the firstmovementbeing the most violent in order that the fine particles be separatedfrom the mass and also to remove the dust and dirt carried by the piecesthemselves;

Theseand other objects of my invention will be more fully and betterunderstood by reference to. the accompanying sheets of drawings and inwhich Figure 1 is a side elevational view of my improved invention,portions of which have been removed or broken away to more clearlyillustrate the construction; and

Figure 2 is an end elevational View of the apparatus shown in Figure lin. which certain portions of the supporting framework and the springmeans have been omit-. ted for purposes of clearness.

Referring now specifically to the draw ings, a pair of transverselyextending beams 10 and 11 are shown adapted to support a pair of sillsl2 and 13 extending'longitudinally of the screening device, these sillshaving a pair of angles 14 and 15 extending longitudinally thereof,these members forming the base framework for the screening ap' paratushereinafter 7 described. An upper screen support is PIOVlClGIIlcomprlsmg a:

pair of standards 16, which are suitably secured, to the angles 14 and15 and braced by brackets 17 with a second pair of up right members 18being provided," these members being angularly disposed wlth referenceto the members 16 and slightly shorter than these members. It will beunderstood that Figure 1 only shows the side members on one sideof thecomplete construction. Thus there is a standard on the opposite sidecorresponding to the member 16 which is not shown. The same will applyto other members which are substantially duplicates of the membersreferred "to and therefore are not illustrated. At the upper ends of themembers 16 and 18 and connected thereto, is a pair of angularlyextending lower frame members 19 and a. pair of'upper frame members 20,these members being diagonally disposed so that the screen when mountedthereon is tilted at an angle of-approximatel 25 to ahorizontal lane.Mounted upon t e members 19 on eac side of the framework, is apluralityof upperand lower bearing brackets 21, through which .a pair of shafts22 and 23 extend, having gear wheels 24 and 25 thereon adapted to meshwith each other, the shaft 22 having a driving pulley (not shown)secured thereto by means of which the whole apparatus is driven bya'belt attached thereto and leading to any suitable source of power.Mounted upon the upper frame members 20 is a air of bearing blocks 25-which are secured to the frame member in any suitable manner and whichhave V- shaped recesses 26 in the upper sides thereof '35 peripherythereof at right angles to each -sions' 31, 31 extending outwardtherefromv adapted to receive a cross bar 27 with pins 28 extendingthrough the brackets 25 and through the rocker brackets 27 so as to holdthe screens in proper position. A frame 29, rectangular in shape, isprovided havin a screen 30 mounted thereon in any suitailile manner andhaving a plurality of extenat each of its corn'ers, and thence downwardinto a V-shaped form between the outer ends of which are rollers 32, 32mounted upon pins 32. The frame 29 has a plurality of spaced trunnions33 located on the under side thereof at each of its sides. The rockerbar 27- is adapted to rest between each air of trunnionsat each of theends of the rame-29 with a pair of pins 34 extending through thetrunn1ons'33 by means of .WlllCll the frame 29 is secured to thebrackets 25.

A plurality of two-way springs 35 are placed under the frame 29 at eachof the corners.

thereof and are mounted upon the upper side frame members 20 in anysuitable manner, these springs permitting vibration or rocking of-thescreen and frame 29 inthe brackets 25 when the device is in opera-'tion, as hereinafter described. The springs 35 on one side only of theapparatus have 31 at t e upper corners of the frame 29, so

' that as each one of .the arms 38 strike the roller, the screen isgiven a rocking or an.

.- oscillatory movement.

been illustrated,'but it will be understood that corresponding springsare provided on the opposite'side but are not shown;

.JMounted upon the shaft 22 adjacent each of its. ends is a pair ofdrums 36, 36 having a plurality of arms 38, 38 mounted thereon andextending outwardly beyond the outer other, said arms 38 having theirouter ends turned backwards in a direction opposite to the travel of thedrums and adapted to en-- gage a ainst the rollers 32 in the extensionsA air of drums 37 are mounted upon the shaft 23- adjacent the endsthereof, with a plurality of arms 39, 39 uponieach of these drums whichextend at right angles to, each other, the outer ends of w ich areangularly disposed, andin a direction opposite to the arms 38, 38 forthe reason that the drums 37 turnin a direction opposite to the drums36, the ends of the arms 39 being adapted to engage the rollers I 32 inthe extensions 31 at the lower side of ing upon the strength of thesprings 35, 35

at each of its corners.

speed t mm the screen 30.

A delivery roller 40 is provided over which the coke is passed onto theupper side of the screen 30 and as the device is operated, the screenhaving been given a roc ing action, shakes out the particles of dustthrough the screen, where it falls into a chute placed below thescreening device in any suitable manner.

A second screening unit is provided which is supported at its lower endby a pair of verticalframe members 41, which have secured thereto aplurality of lower frame members 42 andupper frame members 43, the upperframe members carrying a pair of bearing blocks 44, within which a frame45, having a screen 46 secured thereto, is positioned, by means of' atransversely extending rocker bar 47 seated in V-shaped recesses 48inthe upper side of the bearing blocks 44. A pair of trunnions 49 and 50are formed on the under side of the screen member .45 on each sidethereof, between which the rocker bar 47 is placed. A pair of gearwheels 51 and 52 are mounted upon shafts 53 and 54 respectively, with aplurality of drums 55 and 56 mounted upon each end of the said shafts 53and 54 respectively, the gear wheels 51 and 52 bein in mesh with eachother and the gear wheel 51 meshing with the gear wheel 25 so that asthe upper section of the screen is operated, the screen 46 will also beoperated at the sametim'e. ;The screen frame 45 has a plurality oftwo-way springs 57 mounted under each corner thereof with a plurality ofextensions 58, 58 extending downward therefrom at each of the cornersthereof, with rollers 59, 59 positioned therein adapted to be engaged bya plurality of arms 60, 60 carried by the drums 55 and other arms 61, 61carried by the drums 56, each of the drums 55 and 56 having three screenrocking arms placed thereon in equal distant relation witheach other atan angle of approximately 120 thereto so that the screen 46 is o eratedat a slightl lower rate of uitable bearing blocks 62, 62 are providedwhich are secured to the lower frame members 42 in any suitable manner,providing mountings for the shafts 53 and 54 at each of their ends.

At the lower end of the device a pair of longitudinally extending lowerframe members 63 are provided which are secured at their upper ends tothe angularly disposed members 41 and are secured to the outer ends ofthe angles 14 by a pair of brackets 64, a pair of upperframe members 65being provided, the upper ends of which are sooured to the diagonallyextending member 41, and also to a pair of posts. 66, with a pluralityof bearing blocks 67, 67 being provided which are mounted to thediagonaltr extending sills 63 and within which shafts 6S and 69 areplaced, each of these shafts 7 having drums 70 and 71 adjacent theirends,

- gear wheel 74 also being in mesh with the gear 52 so that as the upperscreens 30 and 46 are oscillated, a lower screen 76, mounted upon aframe 77, is also oscillated by the action of the arms 72 and 73. Theframe 77 at each of the corners thereof, has a plurality -of extensions78, 78 thereon having rollers 79 in the outer ends thereof with two- Waysprings 80 positioned upon the frame members 65 and mounted under theframe member'77 at each of the corners thereof, so that as the arms 72and 73 engage against the rollers 79-, the screen 76 isgiven a rockingaction, this rocking action being slower and therefore less violent thanthe movement given to eachof the other screens heretofore described. Apair of brackets 81 is provided having V-openings 82 in the upper sidesthereof within which. a transversely extending member 83 is positionedwhich is placed between a pair of trunnions 84 and 85 formed on theunder side of the frame member 77 with a pin 86 extending through thebrackets 81 and through the transversely extending member 83 and withother pins 87 extending through the trunnions 84 and 85 and through thetransversely extending meniber 83 so that the frame 77 is held inposition in the brackets 81.

In operation of the device. the coke, or,

other material to be screened, is delivered over the drum 40 anddeposited on the upper side of the screen 30 andas the device isoperated, the-arms 38, 38 striking against the rollers 32 give thisscreen a rapid vibra-' tory rocking action, tossing the pieces of cokeon the screen and shaking them rapidly so that the dust and fineparticles of coke are removed fromthe mass and pass through the screen,this screen preferably operating at approximately 96times per minute.The material passes downward over the screen 30 onto the screen46 whereit is given a further shaking and other particles of dirt and dustremoved therefrom, this screen be ing operated at approximately 72 timesper minute and the coke therefore not receiving such a violent shakingas it does on the first screen and which is adapted to thoroughly removeand to shake loose the particles of dust adhering to the pieces of coke,in additionto removing the dust andloose particles from the mass.Thematerial passes downward over the second screen onto the third unitwhich oscillates at approximately 48 times per minute, this screen beingoperated more slowly in order that the dust and dirt may be merelyshaken out of the screen without subjecting the particles or pieces ofcoke to such violent agitation as to break the pieces, the dust andsmall particles of coke which are removed from the articles droppingthrough the screen and into a chute provided for receiving theseparticles, underneath the screen. The screened coke after passing overthe screens is deposited into a chute or onto a receiving belt as may bedesired.

It will be thus understood that I provide a screen having a rockingresilient action by reason of 1 the springs mounted under each corner,-one unit of which operates rapidly in order to not only shake theparticles of dust anddirt out" of the larger particles, but also toremove the dust and dirt adhering to the larger particles of coke, andas the coke passes over this screen and is deposited onto a'secondscreen the action is less violent, being adapted merely to shake theparticles of dust and dirt out of the coke and that the last screen isstill less violent and operated more slowly so that the dirt is removedfrom the coke with as little breakage as possible and also with aslittle abrasion action as possible with the pieces of coke one againstthe other in order to reduce the formation of dust to a minimum duringthe screening operation. It will be noted that the screens are placed inangular relation so that there is a tendencyof the coke to slide acrossthe screen by gravity, butthe rocking action of the screen causes thecoke to travel thereover in a series of jumps or loops with one movementof the screen tending to 'cause the coke to travel over the screentoward the discharge side thereof and the second movement of the screenfrom the opposite end throwing the particles of coke upward so that thetendency is to retard its movement and also to turn the particles ofcoke over so that they will not pass over the screen with particles ofdust and dirt adhering to the upper surface of the coke. 1

While I have described more or less precisely the details ofconstruction, I do not wish to be understood as limiting myself thereto,as I contemplate changes in form and the proportion of parts and thesubstitution of equivalents as circumstances may suggest or renderexpedient without departing from the spirit or scope of my invention.

I claim: Y 1. In combination a screen, a frame upon which said screen ismounted, a central mounting member for said screen, springs secured tosaid frame and also to said screen at each of its ends depending armsfrom said screen, a plurality of drums and arms mounted on saiddrums,'said arms being so placed on said drums that a rocking movementis imparted to said screens.

2. Incombination, a screen, a frame upon which said screen ismounted, aplurality of springs at each end of said screen, a plurality of armsdepending from said screen, a pair of shafts, a plurality of armssecured to said shafts'adapted to contact with the arms secured to saidscreen, a pair of gear wheels adapted to operate said arms in timedrelation with each. other, whereby the arms are alternately brought incontact with the screen at'each of its ends.

,3. A screening device comprising in combinhtion a main frame, aplurality of screen frames, blocks mounted on said main frame in centralposition with respect to said screen frames, rocking bars" secured tothe said screen frames and to said blocks, springs mounted between thescreen frames and the main frame, trunnions on said screen frames,

a plurality of rotating drums, connecting means for said drums, and armsmounted on said drums in different spaced relation with each other andadapted to engage said trunnions whereb is. progressively given to thesaid screens.

4. In a screening device the combination of a main frame, a plurality.of screen frames, screens mounted on said screen frames, mountingmembers secured to said screen frames intermediate the ends of the.screen frames, rocking bars'connected to sald screen frames and to saidmounting means, springs poslt oned between the said mam frame and sa1dscreen frames at each of the ends. thereof, a plurality of trunnions onsaid screen frames, rotating drums under each end of said screens, andarms on said drums adapted to contact with the said trunnions, the drumsunder each screen having a progressively lesser number of arms thereontowards the discharge end of said screen.

5. In a screening device, the combination of a main frame, a pluralityof screen frames, screens mounted on said screen frames, mountingmembers secured to said screen frames intermediate the ends of thescreen frames, rocking bars connected to a decreasing movement 6. Ascreening device comprising in com bination, a main frame, aplurality'of screen frames, a pair of blocks havlng recesses on theirupper sides mounted on said main frame intermediate the ends of saidscreen frames, rockmg bars mounted 1n the recesses in said blocks andconnected to the said screen frames, springs mounted on said main frameand under the screen frames at each of the ends thereof, trunnions ateach end of the said screen frames, a plurality of drums mounted on saidframe, arms on said drums, and gears connecting the said drums, the

arms on the drums operating each screen, de-

creasing progressively towards-the discharge end of the screen.

7. A screening device comprising in combination, a main frame, aplurality of screen frames having a pair of spaced trunnions thereon, apair of blockshaving recesses on their upper sides mounted on said mainframe intermediate the ends of said screen frames, rocking bars mountedin the recesses in said blocks and connected to the said screen frames,springs mounted on said main frame and under the screen frames at eachof the ends thereof, trunnions at each end of the said screen frames, aplurality of' drums mounted on said frame, arms on said drums, and gearsconnecting the said drums, the arms on the drums operating each screen,decreasing progressively towards the discharge end-of the screen.

Signed at J oliet, Illinois, this 17th day of November, 1926.

JAMES CRABB, SR.

